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(x + 7)² = 2²
x² + 14x + 49 = 4
x² + 14x + 49 - 4 = 0
x² + 14x + 45 = 0
(x + 9)(x + 5) = 0
x + 9 = 0 atau x + 5 = 0
x = -9 x = -5
HP = {-9 , -5}
2. |5 - x| = 4
(5 - x)² = 4²
25 - 10x + x² = 16
x² - 10x + 25 - 16 = 0
x² - 10x + 9 = 0
(x - 1)(x - 9) = 0
x - 1 = 0 atau x - 9 = 0
x = 1 x = 9
HP = {1 , 9}
3. |3x - 2| = 7
(3x - 2)² = 7²
9x² - 12x + 4 = 49
9x² - 12x + 4 - 49 = 0
9x² - 12x - 45 = 0 (kesemua ruas dibagi 3)
3x² - 4x - 15 = 0
(x - 3)(3x + 5) = 0
x - 3 = 0 atau 3x + 5 = 0
x = 3 x = -5/3
HP = {-5/3 , 3}
4. |8 - 5x| = 3
(8 - 5x)² = 3²
64 - 80x + 25x² = 9
25x² - 80x + 64 - 9 = 0
25x² - 80x + 55 = 0
5x² - 16x + 11 = 0
(x - 1)(5x - 11) = 0
x - 1 = 0 atau 5x + 11 = 0
x = 1 x = -11/5 = - 2 1/5
HP = {-2 1/5 , 1}